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<h1>The International Obfuscated C Code Contest</h1>
<h2>2004/gavin - Best of Show</h2>
<h3>Mini-OS</h3>
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<a class="Left" href="../gavare/index.html">← 2004/gavare</a>
<a class="Left" href="../index.html">↑ 2004 ↑</a>
<a class="Left" href="../hibachi/index.html">2004/hibachi →</a>
<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/gavin.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Gavin_Barraclough">Gavin Barraclough</a><br>
Location: <a href="../../location.html#UK">UK</a> - <em>United Kingdom of Great Britain and Northern Ireland</em> (<em>United Kingdom</em>)</li>
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<h2 id="to-build">To build:</h2>
<pre><code> make</code></pre>
<p>There is an alternate version for those who wish to use
<a href="https://www.qemu.org">QEMU</a> rather than having
to reboot and rely on having a <a href="https://en.wikipedia.org/wiki/Floppy_disk">floppy
drive</a> (<a href="https://en.wikipedia.org/wiki/History_of_the_floppy_disk">if you even
remember</a> what those are
:-) ) etc. See <a href="#alternate-code">Alternate code</a> below.</p>
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
<p>The current status of this entry is:</p>
<blockquote>
<p><strong>STATUS: INABIAF - please DO NOT fix</strong></p>
</blockquote>
<p>For more detailed information see <a href="../../bugs.html#2004_gavin">2004/gavin in bugs.html</a>.</p>
<h2 id="to-use">To use:</h2>
<pre><code> ./gavin</code></pre>
<h2 id="try">Try:</h2>
<p>To enjoy the results (on a Linux/x86 machine) with a floppy drive
(<a href="https://en.wikipedia.org/wiki/Old_age">remember</a> those? We do!):</p>
<pre><code> su</code></pre>
<p>Make a floppy with an ext2 filesystem (<code>mke2fs /dev/fd0</code> replacing <code>fd0</code> with
whatever the floppy device is!), mount it under <code>/mnt/floppy</code> and then:</p>
<pre><code> cp kernel fs.tar lilo.conf boot.b /mnt/floppy</code></pre>
<p><strong>NOTE</strong>: If the version of your lilo is not 21.4, use the appropriate <code>boot.b</code> file.</p>
<p><strong>NOTE</strong>: If your floppy drive is not <code>/dev/fd0</code>, edit <code>lilo.conf</code> appropriately.</p>
<pre><code> lilo -C /mnt/floppy/lilo.conf</code></pre>
<p>Boot from the floppy on an x86 machine with a PS/2 keyboard and mouse.
Move the window away from the corner.</p>
<pre><code> vi gavin.c</code></pre>
<p>Scroll up and down the file with up-arrow and down-arrow.</p>
<pre><code> sh</code></pre>
<p>You can have several shell windows:</p>
<pre><code> vi README.md
./prim</code></pre>
<p>Press and hold any key.</p>
<h2 id="alternate-code">Alternate code:</h2>
<p>This version’s main difference is that the macro <code>K</code> is redefined to <code>1</code> so that
you can use it with <code>QEMU</code>.</p>
<h3 id="alternate-build">Alternate build:</h3>
<pre><code> make alt</code></pre>
<h3 id="alternate-use">Alternate use:</h3>
<p>The use is mostly the same as <code>gavin</code> except that one initially executes <code>gavin.alt</code>
and one will have to use <code>QEMU</code> instead. The files
generated are the same names. See <a href="#to-use">to use</a> and <a href="#try">try</a> above as
well as the judges’ remarks below plus <a href="gavin.html">gavin.html</a>.</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>Over the years, we’ve seen a program that immediately dumps core if executed on
the “wrong” architectures (e.g., <a href="../../1984/mullender/index.html">1984/mullender</a> entry) and a
program that dumps core after a while (e.g., <a href="../../2001/bellard/index.html">2001/bellard</a> entry).
This entry will happily compile and execute on most any architecture - the trick
is that the result, to be useful, must be produced (and can only be enjoyed) on
a particular architecture. We have not decided yet whether to disallow this for
future contests.</p>
<p>If you do not want to mess with a floppy and you use GRUB, see
<a href="gavin.html">gavin.html</a>.</p>
<p>You can put additional text files in <code>fs.tar</code> for browsing with vi.</p>
<p>If you do not want to bother rebooting your computer at all, see
<a href="https://www.qemu.org" class="uri">https://www.qemu.org</a> for QEMU (by <a href="../../authors.html#Fabrice_Bellard">Fabrice
Bellard</a>, an IOCCC winning author) and use
the <a href="#alternate-code">Alternate code</a> instead. You’ll have to move the mouse to
trigger the initial screen update.</p>
<p>The judges were able to write a few more programs to run in this OS.
What are the limitations for such programs?</p>
<p>What can you do and what can you not do in such programs?</p>
<p>The program called <code>prim</code>, written by the judges, computes and prints prime
numbers.</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p>This is a 32-bit multitasking operating system for x86 computers, with GUI and
filesystem, support for loading and executing user applications in ELF binary
format, with PS/2 mouse and keyboard drivers, and VESA graphics. And a command
shell. And an application - a simple text-file viewer.</p>
<p>The OS has ended up as a traditional monolith with one entry point for syscalls,
with apps treated as cooperative-multitasking tasks that can be sent different
messages (e.g. ‘initialize’, ‘key hit’, ‘render to buffer’) through their main
entry point, and which will return control to the OS after having performed the
necessary work. Applications are passed a pointer to their task structure,
which is partially defined by the OS, and partially for the application’s own
use.</p>
<p>The program compiles into a tool to build a kernel image,
so having built the program, the <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/Makefile">Makefile</a> will run it,
redirecting the output into a file called <code>kernel</code>.
The Makefile will then proceed to build a root filesystem image.
This involves rebuilding the program with different compiler flags,
then building a tarball containing the resulting programs
(the filesystem format supported by the OS is the tarball format).</p>
<p>For further usage information see <a href="gavin.html">gavin.html</a>.</p>
<p>The filenames <code>vi</code> and <code>sh</code> are significant, and should not be changed.</p>
<h3 id="known-features">Known ‘features’:</h3>
<p>Known issues are really too plentiful to list.</p>
<p>If the mouse pointer goes off the left hand side of the screen
it will reappear on the right, and vice-versa.
If it goes off the top or bottom, it will go and corrupt some memory.</p>
<p>The file system is kinda optimistic about matching names, so,
for example if you type the command <code>shell</code> into a command-line
it will execute the program <code>sh</code> - close enough a match for it.</p>
<p>The <a href="https://en.wikipedia.org/wiki/Executable_and_Linkable_Format">ELF binaries</a>
are not loaded at the correct address, and their entry point must be the start
address of the <a href="https://en.wikipedia.org/wiki/Code_segment">text segment</a>.</p>
<p>The keyboard driver can cope with the basic alpha-numeric keys,
but gets confused by fancy things like <code>shift</code> or <code>backspace</code>.</p>
<p>In the text-file viewer, <code>vi</code>, the up/down and PgUp/PgDn keys
scroll up or down by one line. There is nothing to stop you
from scrolling above the top of the file, and pressing any
other keys might have an undefined effect.</p>
<p>The x86 is bootstrapped into 32bit mode in 6 instructions, with 4 more to set up
data/stack segments and a stack-pointer to allow C code to be run. On top of
this there are also about a dozen instructions to switch the video card into
graphics mode. All in all, a relatively tiny number of instructions next to the
size of the C program. Also, the string is mostly composed of data - a
Linux-esque kernel header for the bootloader, protected mode descriptor tables,
keyboard maps, etc. (I should also mention that it contains mini functions to
perform an x86 <code>in</code> and <code>out</code> instruction - to allow the keyboard & mouse to be
driven from C code).</p>
<p>Porting to another architecture should be relatively easy<a href="#fn1" class="footnote-ref" id="fnref1" role="doc-noteref"><sup>1</sup></a> -
the string simply needs be replaced with one containing
data & code suitable for the new target platform.
Accesses to data in the string are made relative to the define <code>V</code>,
so these may need updating as appropriate (<code>0x90200</code> is the address
at which a Linux bootloader loads an x86 kernel image).</p>
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<section id="footnotes" class="footnotes footnotes-end-of-document" role="doc-endnotes">
<h5>Footnotes</h5>
<ol>
<li id="fn1"><p>* ;-)<a href="#fnref1" class="footnote-back" role="doc-backlink">↩︎</a></p></li>
</ol>
</section>
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<div id="inventory">
<h1 id="inventory-for-2004gavin">Inventory for 2004/gavin</h1>
</div>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/gavin.c">gavin.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/gavin.alt.c">gavin.alt.c</a> - alternate source code</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/gavin.orig.c">gavin.orig.c</a> - original source code</li>
<li><a href="gavin.html">gavin.html</a> - author’s usage guide</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/lilo.conf">lilo.conf</a> - lilo boot loader configuration</li>
<li><a href="boot.b">boot.b</a> - boot sector</li>
<li><a href="img/fs.tar">img/fs.tar</a> - tarball of root file system</li>
<li><a href="img/kernel">img/kernel</a> - x86 linux boot executable zImage</li>
<li><a href="prim">prim</a> - prime number printing program from judges</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="2004_gavin.tar.bz2">2004_gavin.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/gavin.md">gavin.md</a> - markdown source for gavin.html</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/.path">.path</a> - directory path from top level directory</li>
<li><a href="index.html">index.html</a> - this web page</li>
</ul>
<hr style="width:10%;text-align:left;margin-left:0">
<h4>
Jump to: <a href="#">top</a>
</h4>
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<div class="footer">
<div id="copyright"><h3>Copyright © 1984-2024 by Landon Curt Noll:
<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
target="_blank"
rel="license noopener noreferrer">Some Rights Reserved</a></h3>
<p>
This work is <b>licensed by Landon Curt Noll</b> under
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
target="_blank"
rel="license noopener noreferrer"
style="display:inline-block;">CC BY-SA 4.0</a></b>.
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<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
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rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
before using the licensed material.<br>
You may wish to review the
<b><a href="../../license.html"
target="_blank"
rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
of <b>CC BY-SA 4.0</b>.<br>
</p>
</div>
<div id="coda"><h3>Coda</h3>
<p>
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2004%2Fgavin%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
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